What you'll do

• Build and maintain internal and developer-facing APIs and services that power the Web App and developer experience
• Develop and evolve public API functionality, including task types, validation, routing and WebSocket/REST behaviour
• Own and maintain the Admin API and panel as an internal platform used across Runware
• Work with usage, billing and customer data to ensure accuracy and reliability, including Stripe
• Investigate and resolve production issues and security vulnerabilities affecting the Web App and its APIs
• Write, test and review clean, maintainable code, contributing to strong engineering practices and code quality
• Work with Product, Design and engineering teams to clarify requirements, identify dependencies and define well-scoped technical solutions
• Contribute to technical decisions, work across frontend and backend boundaries where appropriate, and collaborate with the wider Backend team where specialist knowledge or shared systems are involved
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Requirements

• Strong experience building backend systems and APIs
• Strong programming experience in one or more backend languages, with the ability to quickly learn and work effectively in new languages and technologies
• Experience building reliable, maintainable and well-tested production systems
• Good understanding of API design, asynchronous workloads and distributed systems concepts
• Strong engineering fundamentals around security, reliability and performance
• Strong communication and collaboration skills, with the ability to work effectively across engineering, Product and Design
• Strong ownership and autonomy, with good judgement around when to involve others
• Comfortable using AI-assisted development tools and agents to improve productivity, while understanding their limitations and maintaining responsibility for the quality, security and correctness of the resulting code
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Nice to have

• Experience with PHP, Symfony and/or Doctrine
• Experience with WebSockets
• Experience building public APIs or other developer-facing products
• Experience with usage-based billing, credits or financial data
• Experience contributing to architectural decisions and mentoring other engineers
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